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<DIV class="date"><SPAN class="year">2010</SPAN><SPAN 
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<H3><A href="http://qq361119908.iteye.com/blog/665074">GPS开发常用方法 
和用Criteria确定android location providerGPS开发常用方法</A><EM class="actions"></EM></H3>
<UL class="blog_categories"><STRONG>博客分类：</STRONG> 
  <LI><A href="http://qq361119908.iteye.com/category/104365">android</A></LI> 
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<DIV id="blog_content" class="blog_content"><STRONG>GPS常用方法总结</STRONG><BR>
<BR><STRONG>取得LocationProvider</STRONG><BR><PRE class="java" name="code">public void getLocationProvider() 
  { 
    try 
    { 
      Criteria mCriteria01 = new Criteria(); 
      mCriteria01.setAccuracy(Criteria.ACCURACY_FINE); 
      mCriteria01.setAltitudeRequired(false); 
      mCriteria01.setBearingRequired(false); 
      mCriteria01.setCostAllowed(true); 
      mCriteria01.setPowerRequirement(Criteria.POWER_LOW); 
      strLocationProvider =  
      mLocationManager01.getBestProvider(mCriteria01, true); 
       
      mLocation01 = mLocationManager01.getLastKnownLocation 
      (strLocationProvider); 
    } 
    catch(Exception e) 
    { 
      mTextView01.setText(e.toString()); 
      e.printStackTrace(); 
    } 
  } </PRE>
<BR><STRONG>获取经纬度，并返回GeoPoint对象</STRONG><BR><PRE class="java" name="code">private GeoPoint getGeoByLocation(Location location)
  {
    GeoPoint gp = null;
    try
    {
      /* 当Location存在 */
      if (location != null)
      {
        double geoLatitude = location.getLatitude()*1E6;
        double geoLongitude = location.getLongitude()*1E6;
        gp = new GeoPoint((int) geoLatitude, (int) geoLongitude);
      }
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }
    return gp;
  }</PRE>
<BR><STRONG>将经纬度转换成实际屏幕坐标</STRONG><BR><PRE class="java" name="code">Point myScreenCoords = new Point();
GeoPoint tmpGeoPoint = new GeoPoint((int)(mLocation.getLatitude()*1E6),(int)(mLocation.getLongitude()*1E6));
mapView.getProjection().toPixels(tmpGeoPoint, myScreenCoords);</PRE>
<BR><BR><STRONG>点击MapView任意一点获得坐标</STRONG><BR><PRE class="java" name="code">@Override 
public boolean onTouchEvent(MotionEvent ev) { 
    int actionType = ev.getAction(); 
    switch (actionType) { 
    case MotionEvent.ACTION_UP:      
            Projection proj = mapView.getProjection(); 
            GeoPoint loc = proj.fromPixels((int)arg0.getX(), (int)arg0.getY());  
            String sirina=Double.toString(loc.getLongitudeE6()/1000000); 
            String dolzina=Double.toString(loc.getLatitudeE6()/1000000); 
    
    } 
 
    return false;
}</PRE>
<BR><BR><BR><STRONG>经纬度改变来刷新地图</STRONG><BR><PRE class="java" name="code">  public void refreshMapView() 
  { 
    GeoPoint p = new GeoPoint((int)(dLat* 1E6), (int)(dLng* 1E6)); 
    mMapView01.displayZoomControls(true);
    /* 将Map的中点移至GeoPoint */
    mMapController01.animateTo(p); 
    mMapController01.setZoom(intZoomLevel); 
  } </PRE>
<BR><BR><STRONG>根据当前的经纬度，获取相关的一些地址信息</STRONG><BR><PRE class="java" name="code">/* 创建Geocoder对象 */
        //根据地理环境来确定编码
        //注意这个Locale是java.util.Locale包的类,获取当前系统设定的语言
        Geocoder gc = new Geocoder
        (EX09_05.this, Locale.getDefault());
        
        /* 取出地理坐标经纬度 */
        double geoLatitude = (int)gp.getLatitudeE6()/1E6;
        double geoLongitude = (int)gp.getLongitudeE6()/1E6;
        
        /* 自经纬度取得地址（可能有多行地址） */
        List&lt;Address&gt; lstAddress = 
        gc.getFromLocation(geoLatitude, geoLongitude, 1);
        
        StringBuilder sb = new StringBuilder();
        
        /* 判断地址是否为多行 */
        if (lstAddress.size() &gt; 0)
        {
          Address adsLocation = lstAddress.get(0);

          for(int i=0;i&lt;adsLocation.getMaxAddressLineIndex();i++)
          {
            sb.append(adsLocation.getAddressLine(i)).append("\n");
          }
          sb.append(adsLocation.getLocality()).append("\n");
          sb.append(adsLocation.getPostalCode()).append("\n");
          sb.append(adsLocation.getCountryName());
        }
        </PRE><BR><BR><BR> <STRONG>根据输入地址，取得其GeoPoint对象 </STRONG><BR><PRE class="java" name="code">  private GeoPoint getGeoByAddress(String strSearchAddress) 
  { 
    GeoPoint gp = null; 
    try 
    { 
      if(strSearchAddress!="") 
      { 
        Geocoder mGeocoder01 = new Geocoder 
        (EX09_07.this, Locale.getDefault()); 
         
        List&lt;Address&gt; lstAddress = mGeocoder01.getFromLocationName
                           (strSearchAddress, 1);
        if (!lstAddress.isEmpty()) 
        { 
          Address adsLocation = lstAddress.get(0); 
          double geoLatitude = adsLocation.getLatitude()*1E6; 
          double geoLongitude = adsLocation.getLongitude()*1E6; 
          gp = new GeoPoint((int) geoLatitude, (int) geoLongitude); 
        } 
      } 
    } 
    catch (Exception e) 
    {  
      e.printStackTrace();  
    } 
    return gp; 
  } </PRE>
<BR><BR><STRONG>地图放大缩小按钮</STRONG><BR><PRE class="java" name="code"> /* 放大Map的Button */
    mButton02 = (Button)findViewById(R.id.myButton2); 
    mButton02.setOnClickListener(new Button.OnClickListener() 
    { 
     
      public void onClick(View v) 
      { 
        intZoomLevel++; 
        if(intZoomLevel&gt;mMapView01.getMaxZoomLevel()) 
        { 
          intZoomLevel = mMapView01.getMaxZoomLevel(); 
        } 
        mMapController01.setZoom(intZoomLevel); 
      } 
    }); 
     
    /* 缩小Map的Button */
    mButton03 = (Button)findViewById(R.id.myButton3); 
    mButton03.setOnClickListener(new Button.OnClickListener() 
    { 
       
      public void onClick(View v) 
      { 
        intZoomLevel--; 
        if(intZoomLevel&lt;1) 
        { 
          intZoomLevel = 1; 
        } 
        mMapController01.setZoom(intZoomLevel); 
      } 
    });</PRE>
<BR><BR>以下文章转载：<A href="http://marshal.easymorse.com/archives/2528" target="_blank">http://marshal.easymorse.com/archives/2528</A>
<BR>android location provider有两个：<BR><BR>&nbsp;&nbsp;&nbsp; * 
LocationManager.GPS_PROVIDER：GPS，精度比较高，但是慢而且消耗电力，而且可能因为天气原因或者障碍物而无法获取卫星信息，另外设备可能没有GPS模块；
<BR>&nbsp;&nbsp;&nbsp; * 
LocationManager.NETWORK_PROVIDER：通过网络获取定位信息，精度低，耗电少，获取信息速度较快，不依赖GPS模块。<BR>
<BR>为了程序的通用性，希望动态选择location provider。对android通过Location 
API显示地址信息做了个别改动，可以看到使用了gps定位，精度较高：<BR><BR><IMG src="GPS开发常用方法_files/d38467c5-217c-3131-87e5-1f2743f5a22a.png">
<BR><BR>这里使用到了Criteria，可根据当前设备情况自动选择哪种location provider。见<BR><PRE class="java" name="code">LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);// 设置为最大精度
criteria.setAltitudeRequired(false);//不要求海拔信息
criteria.setBearingRequired(false);// 不要求方位信息
criteria.setCostAllowed(true);//是否允许付费
criteria.setPowerRequirement(Criteria.POWER_LOW);// 对电量的要求

location = locationManager
        .getLastKnownLocation(locationManager.getBestProvider(criteria, true));</PRE>
<BR>原来的写法很简单：<PRE class="java" name="code">LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

location=locationManager.getLastKnownLocation(LocationManager.NETWORK</PRE>
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<DIV class="comment_content">你好，我想取得卫星个数应该怎么做？</DIV></DIV></DIV>
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